Photoluminescence in poly(3-hexylthiophene)

Samuel, Ifor D. W.; Magnani, Laura; Rumbles, Garry; Murray, K. L.; Stone, Bradley M.; Moratti, Stephen C.; Holmes, Andrew B.

doi:10.1117/12.279277

Cited by 8 publications

(20 citation statements)

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“…For pure P3HT the GSB decay constant is τ 1 = 440 ps and the fit of the P3HT/SWNT solution GSB decay gives τ 1 = 432 ps. These results are in accord with the P3HT singlet ( S 1 ) excited ‐state radiative decay of ∼500 ps as reported in the literature . For pristine P3HT, the decays of the features at 590 and 625 nm can also be fit with a single exponential decay giving τ 1 = 504 ps and τ 1 = 550 ps, respectively.…”

Section: Resultssupporting

confidence: 90%

Spectroscopic characterization of P3HT/SWNT composites synthesized using in situ GRIM methods: Improved polymer ordering via nanoscaffolding

Barrett

Kennedy

Boucher

2013

J Polym Sci B Polym Phys

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Poly(3-hexylthiophene)/single-walled carbon nanotube (P3HT/SWNT) materials are synthesized using an in-situ Grignard metathesis approach. The structural properties and photophysics of the materials are studied using a multitude of techniques, including 1 H NMR, FTIR, UV-vis absorption, Raman, photoluminescence (PL), and transient absorption spectroscopies. P3HT/SWNT composites with high P3HT regioregularity (rr > 96%) are observed. Raman spectroscopic data on the solid samples reveals an increase in the dispersion rate parameter with increasing SWNT concentration, thereby indicating close overlap and strong interactions between P3HT and the carbon nanotubes. Changes in the solution-phase PL quantum yields and excited-state lifetimes relative to pure P3HT support these conclusions, and indicate that strong interactions persist even after the composites are dispersed in organic solvents. The high regioregularity and enhanced P3HT-SWNT interactions are promising attributes for improving the morphology and efficiency of functional P3HT/SWNT materials.

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Section: Resultssupporting

confidence: 90%

Spectroscopic characterization of P3HT/SWNT composites synthesized using in situ GRIM methods: Improved polymer ordering via nanoscaffolding

Barrett

Kennedy

Boucher

2013

J Polym Sci B Polym Phys

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“…Also, mixtures of good and poor solvents have the capacity to generate a larger yield of aggregates than pure marginal solvents, which may impose limitations on the latter toward certain applications, such as optimizing the doping efficiency of P3HT . Despite these advantages of solvent mixtures, the available literature on the assembly and crystallization of P3HT in solvent mixtures is rather scarce, compared to those involving pure solvents . Furthermore, most of these endeavors exploit the fabrication of P3HT aggregates as a means to (1) manipulate the morphology of films and P3HT/nanoparticle composites, (2) affect charge transport and field effect mobility, or (3) study the structure and photophysics of the aggregates.…”

Section: Introductionmentioning

confidence: 99%

Aggregation Behavior of Poly(3‐hexylthiophene) in Solvent Mixtures: Linear Solvation Energy Relationship (LSER) Modeling and COSMO‐RS Calculations

Sapolsky

McFaddin

Boucher

2018

Macro Chemistry & Physics

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The solubility and self‐assembly behavior of poly(3‐hexylthiophene) (P3HT) in solvent mixtures, and the dominant intermolecular forces related to these attributes, have only been partially scrutinized. In this work, the extent of aggregation of amorphous P3HT and the structural order of P3HT aggregates (Mn ≈ 20 kDa and Mn ≈ 75 kDa) are investigated in 54 solvent mixtures of chloroform with acetone, acetonitrile, dichloromethane, ethyl acetate, ethanol, and n‐hexane. Correlations between the molecular mass, the extent of aggregation, the structural order of the aggregates, and the nature of the solvent‐P3HT interactions are studied using a (1) linear solvation energy relationship (LSER) modeling and (2) solubility parameter‐based Flory–Huggins interaction parameters, χ. In addition, COSMO‐RS calculations are used to assess correlations between the extent of aggregation and the activity coefficients, γ, of P3HT. The results reveal that the extent of aggregation and the structural order of the P3HT aggregates are governed by different solvent–P3HT interactions. LSER modeling shows that the nucleophilicity and polarity of the solvent blends are the principal determinant of the structural order of P3HT aggregates. This result, which is based on an independent experimental method, supports previous computational results using COSMO‐RS σ‐profiles to assess the nucleophilicity and polarity of the solvent.

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“…The two spectra (see Fig. ) have identical line‐shape, typical of P3HT in blends . This result demonstrates that the observed PL non‐uniformity are not related to any observable local composition variation, while the absence of F8BT PL demonstrates that efficient FRET energy transfer from F8BT to P3HT takes place in all the active film …”

Section: Discussionmentioning

confidence: 62%

“…The local PL spectra of a bright and a dark 20 μm × 20 μm region in the 579 nm map (see Fig. ) have different line‐shapes, with a higher intensity in the range 675 to 725 nm of the PL from dark regions at 579 nm (thus bright regions above 770 nm) . The line‐shape differences in the local PL spectra of rrP3HT evidences local non‐uniformity of the intermolecular interactions between rrP3HT molecules also affecting the F8BT‐P3HT mixing.…”

Section: Discussionmentioning

confidence: 96%

“…The PL and PC measurements were synchronized pixel by pixel with the laser scanning on the sample (64 μs pixel dwell time). The PL maps were measured in the range 579 ± 25 nm, close to the F8BT PL peak wavelength and in the low wavelength range of the non‐aggregated P3HT PL, using a band‐pass filter, and above 770 nm using a high pass filter, where only P3HT PL is present . The incident excitation power was P = 18 μW, measured by a power meter placed on the objective focal plane.…”

Section: Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Study of spatial inhomogeneity in inverted all-polymer solar cells: Effect of solvent and annealing

Perulli

Lattante

Persano

et al. 2015

J. Polym. Sci. Part B: Polym. Phys.

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The efficiency optimization of bulk heterojunction solar cells requires the control of the local active materials arrangement in order to obtain the best compromise between efficient charge generation and charge collection. Here, we investigate the large scale (10-100 lm) inhomogeneity of the photoluminescence (PL) and the external quantum efficiency (EQE) in inverted all-polymer solar cells (APSC) with regioregular poly(3-hexylthiophene) (P3HT):poly(9,9-dioctylfluorene-cobenzothiadiazole) (F8BT) active blends. The morphology and the local active polymer mixing are changed by depositing the active layer from four different solvents and by thermal annealing. The simultaneous PL and EQE mapping allowed us to inspect the effects of local irregularities of active layer thickness, polymer mixing, polymer aggregation on the charge generation and collection efficiencies. In particular, we show that the increase of the solvent boiling point affects the EQE nonuniformity due to thickness fluctuations, the density non-uniformity of rrP3HT aggregate phase, and the blend components clustering. The thermal annealing leads to a general improvement of EQE and to an F8BT clustering in all the samples with locally decrease of the EQE. We estimate that the film uniformity optimization can lead to a total EQE improvement between 2.7 and 6.3 times. V C 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part B: Polym. Phys. 2015, 00, 000-000

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Photoluminescence in poly(3-hexylthiophene)

Cited by 8 publications

References 0 publications

Spectroscopic characterization of P3HT/SWNT composites synthesized using in situ GRIM methods: Improved polymer ordering via nanoscaffolding

Spectroscopic characterization of P3HT/SWNT composites synthesized using in situ GRIM methods: Improved polymer ordering via nanoscaffolding

Aggregation Behavior of Poly(3‐hexylthiophene) in Solvent Mixtures: Linear Solvation Energy Relationship (LSER) Modeling and COSMO‐RS Calculations

Study of spatial inhomogeneity in inverted all-polymer solar cells: Effect of solvent and annealing

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